The K-Theoretic Formulation of D-Brane Aharonov-Bohm Phases

Figure 2

Surface 𝑊 carries the trivial rank 1 complex vector bundle on it and serves as a bordism between (−𝑆¹,𝜖¹,𝑓₁) and two copies of (𝑆¹,𝜖¹,𝑓₂).